1. There are coder-share agreements, according to which scheduled flights, for example, Lufthansa and Emirates maintain their routes jointly with other, including US, air lines.
Additionally, the grave air incident does not divide dead bodies on their citizenship.
2. The B772 of MH17 had arrived in the border of an air zone of Ukraine, which failed to provide the area, where the army conduct the operations, from Poland.
Warsaw (Poland) air zone is managed by directives of Eurocontrol.
Eurocontrol failed to issue directive to close the direction "Poland air traffic point - Ukraine air traffic point" since they had commenced military operations in April 2014.
Regarding the previous message "U.S. intelligence sources".
The legal system of the air incident investigation based on territorial grounds.
The crash of B777-200 occurred at an altitude of
alleged ~30000 feet in the territory, where the government of Ukraine has been conducting constant military operations against citizens of Ukraine from March 2014.
1. The status of these military operations is not classified according to legal system of Ukraine.
2. This "military zone" had not been reported as "closed zone" for civil air traffic authorities.
In April 2014 Eurocontrol failed to advise to close the flights over Ukraine due to military operations in the territory of Ukraine for other European civil authorities.
So presently, as I see, Eurocontrol is responsible for loss of 295 lives of MH17 AMS-KUL due to failure to react on military actions of the government of Ukraine inside Ukraine.
Civil aviation is not politics and is not a game with lives.